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Course Introduction：Creating files and directories in Java can be implemented in many ways, mainly including using File class and Files class. 1. Use the File class: create a file through createNewFile(), create a single-level or multi-level directory through mkdir() or mkdirs(); 2. Recommend using the Files class: create a file through createFile(), createDirectory() or createDirectories(); 3. Notes include path processing, permission checking, repeated creation judgment and cross-platform compatibility; 4. CreateTempFile() and createTempDirecto can be used

2025-07-20 comment 0  454

Course Introduction：Implementing data packets in PHP can be implemented through array operations and loops. 1) Use loops and array operations to group student data by class; 2) Statistical analysis can be performed when grouping, such as calculating the number of students in each class; 3) Multi-level grouping can be implemented, such as grouping by class and gender, but attention should be paid to performance and memory usage.

2025-05-23 comment 0  436

Course Introduction：In Python, a nested class refers to a class defined inside another class, which is suitable for cases where the inner class is only related to the outer class context. Its core purpose is to improve code readability through logical grouping, such as: classInner: defined in classOuter:. There is no need for special syntax when creating it, it can be instantiated through Outer.Inner() or outer_instance.Inner(), but the inner class does not automatically access outer instance variables by default, and the outer instance needs to be manually passed. Usage scenarios include: inner class is only used by outer class, logical encapsulation requirements, and improved readability; situations that should be avoided include: inner class reusing elsewhere, multi-level nesting, and inner class frequently depends on outer state. Python

2025-07-15 comment 0  215

Course Introduction：There are three common ways to install the PHP development environment: 1. Quickly build with XAMPP, start Apache and MySQL after downloading and installing, and put files into the htdocs folder to access, which is suitable for beginners; 2. Manually install PHP web server, download PHP and configure php.ini, combine Apache or Nginx to set modules and document root directory, suitable for users who need customization; 3. Use Docker to build an isolated environment, define services, mount directories and mapping ports through docker-compose.yml, which is suitable for multi-project or multi-version requirements; common problems include PHP not executing, no-report errors, and version confusion. You can check the MIME type and enable display.

2025-06-26 comment 0  635

Course Introduction：ConfigHelper is a helper class or function that encapsulates configuration read logic for extracting values ??from configuration files and improving code maintainability. 1. It avoids hard coding through centralized management of configurations; 2. It can be implemented as an extended structure that supports multi-level, cache, encryption and other functions; 3. Common configuration storage methods include .env files, JSON/YAML files, databases and environment variables; 4. When using it, the configuration files should be split reasonably, the default values ??should be provided, sensitive information should be distinguished, and the caching mechanism should be paid attention to.

2025-06-27 comment 0  786

Course Elementary  13779

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82290

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13148

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24595

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27455

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.